Across
- 2. a hard, clear material that breaks easily.
- 4. hard fibrous material that makes up most of the substance of a tree
- 7. a position that gets electric current to flow.
- 9. minerals like iron or lead that are found underground in rocks.
- 10. an elastic substance obtained from the milky juice of some tropical plants.
Down
- 1. the liquid that comes from the clouds as rain and forms streams, lakes, and seas
- 3. a device for making, breaking, or changing the connections in an electrical circuit.
- 5. a position that disconnects the light bulb from the battery
- 6. substances that an electric charge can pass through without difficulty
- 8. a material that can change its shape. Most of the materials that are called this are polymers.